Enabling dropping unknown multicast data, Configuration guidelines, Configuration procedure – H3C Technologies H3C S12500-X Series Switches User Manual
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Step Command
Remarks
2.
Enter IGMP-snooping view.
igmp-snooping
N/A
3.
Enable multicast source port
filtering.
source-deny port interface-list
By default, multicast source port
filtering is disabled.
Configuring multicast source port filtering on a port
Step Command
Remarks
1.
Enter system view.
system-view
N/A
2.
Enter Layer 2 Ethernet
interface view.
interface interface-type
interface-number
N/A
3.
Enable multicast source port
filtering.
igmp-snooping source-deny
By default, the multicast source port
filtering is disabled.
Enabling dropping unknown multicast data
Unknown multicast data refers to multicast data for which no forwarding entries exist in the IGMP
snooping forwarding table. When the switch receives such multicast data, one of the following occurs:
•
If the function of dropping unknown multicast data is disabled, the switch floods unknown multicast
data in the VLAN to which the data belongs.
•
If the function of dropping unknown multicast data is enabled, the switch forwards unknown
multicast data to other router ports instead of flooding it in the VLAN. If no other router ports exist,
the switch drops the unknown multicast data.
Configuration guidelines
•
The drop-unknown and igmp-snooping drop-unknown commands are mutually exclusive. Do not
configure them at the same time.
•
You can enable dropping unknown multicast data either for the current VLAN in VLAN view or
globally for all VLANs in IGMP-snooping view. If the configurations are made in both VLAN view
and IGMP-snooping view, the configuration made in VLAN view takes priority.
Configuration procedure
To enable dropping unknown multicast data globally:
Step Command
Remarks
1.
Enter system view.
system-view N/A
2.
Enter IGMP-snooping view.
igmp-snooping
N/A
3.
Enable dropping unknown
multicast data globally.
drop-unknown
By default, this function is disabled.
Unknown multicast data is flooded.
To enable dropping unknown multicast data for a VLAN:
Step Command
Remarks
1.
Enter system view.
system-view N/A
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